I only know what I know so prove me wrong. I think almost all other forms of art, from music to television and cinema to sculpture and mixed media and painting to dance all have proletarian channels, but fashion is almost exclusively for the wealthy. Arguably also it seems to me that a lot of culinary art tends to cater to the wealthy too, so fuck that as well.
It's not aspirationally bougie. Just like outsider art isn't aspirationally bougie. It's aspiring to rise above the mundane, it's just that we've conflated that with bougie because typically it takes a lot of wealth to accomplish.
There are plenty of affordable entry points into fashion. Thrifting has always played a big part in accessible fashion. So have the various fiber arts: sewing, knitting, crochet